Process and apparatus for producing an optically uniform, transparent coating, layer, film or sheet from a mixture of components

Claim 1

A process for producing a homogeneous and highly transparent sheet or film from a mixture of a plurality of components, which comprises mixing the combined reaction components and depositing said mixture on a molding substrate where the reaction is carried out in a layer thereon, wherein the combined reaction components are mixed, first, in a static mixer and, immediately thereafter, in a dynamic mixer, and wherein the combined reaction components are passed for a distance through the static mixer sufficient to achieve only a premixing and without an increase in temperature, and immediately thereafter, the statically premixed reaction mixture is fed to a dynamic mixer, wherein sufficient mixing is effected to obtain the requirement degree homogeneity.

Claim 10

An apparatus for producing a homogeneous and highly transparent sheet or film from a mixture of a plurality of components, which comprises: (a) a mixing chamber having two entrance connections for admitting the reaction components and an exit connection communicating with a static mixer; (b) a static mixer comprising a pipe and being connected downstream of said mixing chamber; and (c) a dynamic mixer disposed downstream of said static mixer; and (d) a flow molding device being connected to an exit of and disposed downstream of said dynamic mixer and wherein said static mixer has mixing elements which comprise a framework composed of laths which are crossed and are latticed or interwoven or a combination thereof, to form elements which are disposed in succession axially along the pipe of which said mixer is comprised, wherein each element is shifted by a radial angle of 90° with respect to the preceding one, and wherein said dynamic mixer is comprised of a casing which houses a driven mixing shaft which is furnished with mixing elements which cooperate with the other said mixing elements disposed in said casing, and wherein said mixing shaft is coupled to a drive means via a permanent magnetic coupling, wherewith the reaction mixture flows between the wall of the casing of the mixer and an interior ring element of the magnetic coupling, which ring is connected to the mixing shaft, and wherewith said interior coupling ring is driven by an exterior magnetic coupling ring disposed exterior to the casing of the mixer.

Claim 11

An apparatus for producing a homogeneous and highly transparent sheet or film from a mixture of a plurality of components, which comprises: (a) a mixing chamber having two entrance connections for admitting the reaction components and an exit connection communicating with a static mixer; (b) a static mixer comprising a pipe and being connected downstream of said mixing chamber; and (c) a dynamic mixer disposed downstream of said static mixer; and (d) a flow molding device being connected to an exit of and disposed downstream of said dynamic mixer and wherein said static mixer has mixing elements which comprise a framework composed of laths which are crossed and are latticed or interwoven or a combination thereof, to form elements which are disposed in succession axially along the pipe of which said mixer is comprised, wherein each element is shifted by a radial angle of 90° with respect to the preceding one, and wherein said dynamic mixer is comprised of a casing which houses a driven mixing shaft which is furnished with mixing elements which cooperate with the other said mixing elements disposed in said casing, and wherein said mixing shaft is coupled to a drive means via a permanent magnetic coupling, wherewith the reaction mixture flows between the wall of the casing of the mixer and an interior ring element of the magnetic coupling, which ring is connected to the mixing shaft, and wherewith said interior coupling ring is driven by an exterior magnetic coupling ring disposed exterior to the casing of the mixer.